/* * Ensoniq Paris Audio File demuxer * Copyright (c) 2012 Paul B Mahol * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/intreadwrite.h"#include "libavcodec/internal.h"#include "avformat.h"#include "demux.h"#include "internal.h"#include "pcm.h" static int epaf_probe(const AVProbeData *p){    if (((AV_RL32(p->buf) == MKTAG('f','a','p',' ') &&          AV_RL32(p->buf + 8) == 1) ||         (AV_RL32(p->buf) == MKTAG(' ','p','a','f') &&          AV_RN32(p->buf + 8) == 0)) &&       !AV_RN32(p->buf +  4) && AV_RN32(p->buf + 12) &&        AV_RN32(p->buf + 20))        return AVPROBE_SCORE_MAX / 4 * 3;    return 0;} static int epaf_read_header(AVFormatContext *s){    int le, sample_rate, codec, channels;    AVStream *st;     avio_skip(s->pb, 4);    if (avio_rl32(s->pb))        return AVERROR_INVALIDDATA;     le = avio_rl32(s->pb);    if (le && le != 1)        return AVERROR_INVALIDDATA;     if (le) {        sample_rate = avio_rl32(s->pb);        codec       = avio_rl32(s->pb);        channels    = avio_rl32(s->pb);    } else {        sample_rate = avio_rb32(s->pb);        codec       = avio_rb32(s->pb);        channels    = avio_rb32(s->pb);    }     if (channels <= 0 || channels > FF_SANE_NB_CHANNELS || sample_rate <= 0)        return AVERROR_INVALIDDATA;     st = avformat_new_stream(s, NULL);    if (!st)        return AVERROR(ENOMEM);     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;    st->codecpar->ch_layout.nb_channels = channels;    st->codecpar->sample_rate = sample_rate;    switch (codec) {    case 0:        st->codecpar->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE;        break;    case 2:        st->codecpar->codec_id = AV_CODEC_ID_PCM_S8;        break;    case 1:        avpriv_request_sample(s, "24-bit Paris PCM format");    default:        return AVERROR_INVALIDDATA;    }     st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id);    st->codecpar->block_align = st->codecpar->bits_per_coded_sample *                                st->codecpar->ch_layout.nb_channels / 8;     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);     if (avio_skip(s->pb, 2024) < 0)        return AVERROR_INVALIDDATA;    return 0;} const FFInputFormat ff_epaf_demuxer = {    .p.name         = "epaf",    .p.long_name    = NULL_IF_CONFIG_SMALL("Ensoniq Paris Audio File"),    .p.extensions   = "paf,fap",    .p.flags        = AVFMT_GENERIC_INDEX,    .read_probe     = epaf_probe,    .read_header    = epaf_read_header,    .read_packet    = ff_pcm_read_packet,    .read_seek      = ff_pcm_read_seek,};